Keywordsice, power system operation, power system reliability, power system security, power transmission lines, power. Deicing ehv overhead transmission lines by shortcircuit currents power puissance this paper presents a new method for deicing ehv bundled conductor transmission lines following severe ice storms. Improved control and weather monitoring allow transmissionicing risks to be hedged without switching or otherwise jeopardizing system security. A cable may be fed through a container with a solgel material having a piezoelectric material to form an uncured layer on the surface of the cable. However, in many countries and regions, due to the geographical positions or meteorological conditions, the transmission lines always suffer the icing problem and huge loss has been caused. The ice coating on the transmission line is extremely destructive to the safe operation of the power grid. Abstractatmospheric icing may be problematic for many industries, including electric utilities. Mechanics analysis of overhead transmission lines based. Icing of power transmission lines during winter storms is a persistent problem, causing outages and costing millions of dollars in repair expenses. A distribution line may have fuses, transformers, voltage regulators, capacitors, reclosers, or any number of other devices attached to the power lines themselves.
In order to improve the forecasting accuracy with regard to icing thickness, this paper. This paper proposed an excitation deicing method of iced wire and theoretically revealed the ice removal mechanism under displacement excitation conditions, by taking the lgj7010 glaze icing wire as the 3d model and analyzing and studying its dynamic response under the effect of. Icing detector for overhead power transmission lines request pdf. Icing of power transmission lines during winter storms is a persistent problem, causing outages and costing millions of rupees in repair expenses. A field datadriven online icingload prediction model that provides predictionbased early warnings can guide the decisionmaking processes regarding the maintenance and deicing of power transformation and transmission systems, thus alleviating losses in power grids caused by the icing of transmission lines. The research on power grid icing has wide application value.
Icing detector for overhead power transmission lines ieee xplore. Aug 11, 2015 introduction when accretion of ice takes place over the conductor then icing occurs. Overhead transmission line icing is one of the main factors affecting safety and reliability of power grid. For transmission lines, icing hazard is one of the most common and serious hazards, posing a huge threat to the safety and stability of the lines 2. Request pdf icing detector for overhead power transmission lines this paper presents a capacitive measurement principle to detect the formation and. Most of the damage on overhead transmission lines was due to ice accumulation on conductors, causing towers to collapse figure 1. The levis deicer is a high voltage direct current hvdc system, aimed at deicing multiple ac power lines in quebec, canada. Combating ice deposits on overhead transmission lines has been a big challenge in cold climate regions for the last eighty years. According to the theoretical analysis and calculation results, the anti.
Using dielectric losses to deice power transmission lines. Field datadriven online prediction model for icing load on. The combination of wind and ice could cause damages. Provided are methods and systems for forming piezoelectric coatings on power line cables using solgel materials.
Therefore, a hybrid model was proposed in this paper, which mixed ensemble empirical mode decomposition eemd. There are many types of ice that can form on transmission lines. Icing on power lines may lead to compromise safety and reliability of electric supply network. Introduction when accretion of ice takes place over the conductor then icing occurs. At present, there are many studies on icing forecasting for power transmission lines. According to the hydrodynamic movement law and heat transfer mechanisms, domestic and foreign scholars have established a variety of transmission line icing forecasting models that consider meteorological factors, environmental factors, and various line. Influence of icing to the corona loss characteristics of.
Based on the predicted rdt of the cables during ice accretion. Deicing ehv overhead transmission lines by shortcircuit currents. Icing load accretion prognosis for power transmission line. Us20160064912a1 antiicing coating for power transmission. Ice accumulation on transmission lines is one of the most serious threats to power grid safety kiessling et. Icing forecasting for power transmission lines based on a. It is the only hvdc system not used for power transmission.
Mannvit offers comprehensive design, consulting and engineering services for all phases of electric power transmission and distribution including decades of experience in the design of overhead power lines and transmission towers. The deicing of power lines by applying highfrequency high voltage. Multivariable time series prediction for the icing process. Nowadays, transmission lines icing caused by ice disaster has become a common problem faced by. Transmission line design information in these notes, i would like to provide you with some background information on ac transmission lines. This technique fell into disuse in the us during the last 50 years. Greg mowry annie sebastian marian mohamed school of engineering soe university of st thomas ust 1. This study proposes a method to predict the remainingdangerous time rdt of the icing load accretion on an interval of the power transmission lines with modified hidden semimarkov model hsmm.
Mechanics analysis of overhead transmission lines based online monitoring lili dai, yongli zhu, zehui liang school of electrical and electronic engineering, north china electric power university, baoding,china email. Ensure adequate transmission from resources to serve loads in a reliable and economical manner. The 1998 ice storm caused severe damage to hydroquebecs power transmission system. For example, it may cause the overload of transmission lines, the flashover of insulator, the noncontemporaneous deice and so on 16. Abstracticing of power transmission lines during winter storms is a persistent problem, causing outages and costing millions of dollars in repair expenses. Detection of ice on wires of overhead transmission lines.
Two parallel wires coaxial cable microstrip line optical fiber waveguide very high frequencies, very low loss, expensive etc. Mechanics analysis of overhead transmission lines based on. The introduction chapter 1 for these design data collection. Other than the overhead power lines, it is appropriate to mention the existence of a document concerning icing on aircraft, published by the federal aviation administration 1993. Overhead transmission lines deicing under different incentive. Intelligent video technology is used to detect the icing condition of transmission lines in real time, and the vibration frequency range of transmission lines is analyzed and calculated.
Icing effects on power lines and antiicing and deicing. Overhead transmission lines deicing under different. Pdf icing of power transmission lines during winter storms is a persistent problem that causes outages and costs millions of dollars in repair. Multivariable time series prediction for the icing process on. Ice buildup on power lines, or icing, can be a common issue for utilities in cold or temperate regions, where storms can deposit thick layers of ice on power assets, including transmission lines, towers and shield wires.
Application research of convolution neural network in. Icing on power transmission lines is a serious threat to the security and stability of the power grid, and it is necessary to establish a forecasting model to make accurate predictions of icing thickness. The earliest reports of icing accidents on power transmission lines appeared in 1932, and since then norway, canada, britain, russia, japan and other countries or regions have had serious icing disasters. An analysis of the reliability of a new dataset of. Since power transmission lines are mostly overhead and could face direct impact of icing, and it is one of the main challenges faced by power distribution. This paper presents a new method for deicing ehv bundled con ductor transmission lines following severe ice storms. Icing will influence the corona characteristics of transmission lines. Ice accretion on power transmission lines is one of the major causes for cable failure in zhaotong area, yunnan province, south china. Ac transmission line impedance parameters ac transmission is done through 3phase systems. Deicing ehv overhead transmission lines by shortcircuit. Consequently, we will discuss the state of the art and prospect of deicing of power transmission lines using mechanical devices, which is. Study on icing prediction of power transmission lines based.
Us9206506b2 antiicing coating for power transmission lines. Deicing of transmission line free download as powerpoint presentation. Under natural conditions, the thickness of ice coating on the transmission line shows a nonlinear growth trend and many influencing factors increase the difficulty of forecasting. Prolong icing can lead to power breakdown and collapse of towers. At present, different design companies have different idea. Since power transmission lines are mostly overhead and could face direct impact of icing, and it is one of the main challenges faced by power distribution companies in cold regions. Deicing of transmission line transmission line capacitor.
Hence, it is convenient to predict the thickness of line icing to carry out timely response to the damage caused by icing, so as to. Transmission lines a transmission line connects a generator to a load a two port network transmission lines include physical construction. Hon tat hui transmission lines basic theories nusece ee2011 28 example 1 a 100. Field datadriven online prediction model for icing load. Deicing is a process in which ice can removed from the iced wire.
In combination with wind, this phenomenon can causes signi cant damage to electric power transmission networks. The rms voltage at the anitnodes is about 100kv rms. The transmission line corridor will inevitably cross the icing area in china. Overhead transmission line icing refers to the phenomenon of freezing rain, rime, wet snow, and mixed icing on overhead transmission lines national meteorological bureau of china 1979. Atmospheric icing of transmission line conductor bundles.
Influence of icing to the corona loss characteristics of the. Transmission lines icing seriously affects the stability of power system. A careful risk analysis is needed to develop the right strategy. However, transmission line icing is affected by a variety of factors, and a multiple linear regression model cannot take all factors into account, meaning the icing forecasting accuracy is greatly reduced. Power line towers design of transmission towers mannvit. Icing detector for overhead power transmission lines. Numerical study of a droplet impact on cylindrical objects. In order to deeply analyze the influence law of the icing to corona loss characteristics, an icing test platform that can be utilized to simulate icing conditions was built. Taking value research of check ice case in 15mm icing. Research article overhead transmission lines deicing under. This manual, brought up to date periodically, describes the latest deicing techniques utilized in the aeronautical field. With global abnormal weather occurring frequently in todays climate, icing disasters on power transmission lines are growing in frequency.
Icing typically builds up in temperatures ranging from. Major recent ice storms caused many downed lines and much loss of customer load. Mccurdy, jd 2003 using dielectric losses to deice power transmission lines with 100 khz highvoltage excitation. Ice accumulation on transmission lines is one of the most serious threats to power grid safety kiessling et al. For deicing of high voltage transmission lines a high frequency excitation at approximately 100khz proposed. Study on icing prediction of power transmission lines. There are many types of ice that can form on transmission lines in the natural environment, including. Image recognition of icing thickness on power transmission. Icing of power transmission lines during winter storms is a persistent problem that causes outages and costs millions of dollars in repair expenses. Antiicing coating for power transmission lines download pdf info publication.
Excitation at approximately 33 kv 100 khz can be used melt ice off of power transmission lines through dielectric losses in the ice itself. Measurement and control field datadriven online prediction. Transmission lines in an ac power system, a tl will operate. Deicing methods using techniques such as conductor heating or mechanical deicing using a roller are possible for overhead lines ranging from 25 to 245 kv. Us9206506b2 antiicing coating for power transmission. Shortterm prediction for transmission lines icing based. Given the characteristics of complexity, nonlinearity, and fitfulness in the line icing process, a model based on a multivariable time series is presented here to predict the icing load of a transmission line.
Research article overhead transmission lines deicing under different incentive displacement qinghe, 1 xifenglv, 1 andxiaotongzhao 2 school of energy power and mechanical engineering, north china electric power university, beijing, china. The system can be used to detect the icing of transmission lines in the deep forest which cannot be reached by walking. Pdf breaking the ice transmission line icing researchgate. Power transmission lines play a key role in a nations economy and peoples daily life. The reliability, maintainability, and safety of power facilities such as power stations and power grids are important for the security of national economies and the livelihoods of people.
Icing of highvoltage overhead power lines can affect the safe operation of the power distribution grid due to the additional weight load of the accumulated ice layer. Millions of people were without power, some for weeks. The design of monitoring and predictive alarm systems is necessary for successful overhead power transmission line icing. The method involves circulating shortcircuit current isc at the rated voltage of the transmission lines and the subsequent action of electromag. Icing and downed lines dashed in quebec, january 1998. Iec 60826 2003 design criteria of overhead transmission lines.
Application research of convolution neural network in image. Icing effects on power lines and antiicing and deicing methods. Antiicing and deicing techniques for overhead lines. However, few papers have focused on the state of the art of the deicing devices form the mechanical engineering point of view.657 1211 1043 424 513 1464 175 30 649 815 217 1606 912 953 1441 418 663 524 61 264 397 571 1344 689 321 840 608 426 705 873 463 371 459